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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 804 (Engine Mechanical - 4.3L (Unit Repair)) >> Repair Instructions >> Timing Chain and Sprockets Installation

Timing Chain and Sprockets Installation

WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required 

J 5590  Pinion Bearing Race Installer - Rear

  1. Install the crankshaft balancer key into the crankshaft keyway.

    The crankshaft balancer key should be parallel to the crankshaft or with a slight incline.

    Fig 1: Crankshaft Balancer Key
    G01689856Courtesy of GENERAL MOTORS CORP.
  2. Align the keyway of the crankshaft sprocket with the crankshaft balancer key.
    CAUTION: Refer to SAFETY GLASSES CAUTION .
  3. Use the J 5590  in order to install the crankshaft sprocket.
    Fig 2: Installing Crankshaft Sprocket Using J 5590
    G01689857Courtesy of GENERAL MOTORS CORP.
  4. Rotate the crankshaft until the crankshaft sprocket alignment mark is at the 12 o'clock position.

    Important:  Install the camshaft sprocket with the alignment mark at the 6 o'clock position.

  5. Install the camshaft sprocket and the camshaft timing chain.
    Fig 3: Camshaft Sprocket & Timing Chain
    G01689858Courtesy of GENERAL MOTORS CORP.
  6. Look to ensure that the crankshaft sprocket is aligned at the 12 o'clock position and camshaft sprocket is aligned at the 6 o'clock position.
    Fig 4: Crankshaft & Camshaft Sprockets
    G01689859Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE .

    Important:  Do not use a hammer to install the camshaft sprocket onto the camshaft. To do so may dislodge the expansion cup plug, camshaft rear bearing hole.

  7. Install camshaft sprocket bolts.

    Tighten 

    Tighten the camshaft sprocket bolts to 25 N.m(18 lb ft).

    Fig 5: Camshaft Sprocket Bolts
    G01689860Courtesy of GENERAL MOTORS CORP.
  8. Install the crankshaft position sensor reluctor ring.
    1. 8.1. Align the keyway on the crankshaft position sensor reluctor ring with the crankshaft balancer key in the crankshaft.
    2. 8.2. Use the J 5590  in order to push the crankshaft position sensor reluctor ring onto the crankshaft until completely seated against the crankshaft sprocket.
    Fig 6: Crankshaft Position Sensor Reluctor Ring
    G01689861Courtesy of GENERAL MOTORS CORP.